हमसे सीखे कोई जीने का सलीका। सफर कैसा भी हो, मौज़ उडाये जाते हैं।। - Amir

Hi all!
I am freshly new blogger of this forum. I need to know some info about Indian Rails. I am a from outside of India. I planned to visit India for the first time in my life. I'll be starting my journey on 17th Dec 14. I had to know some basic things related to this journey. So far I've planned, all the journeys I am gong to do will be by train. I'll be accompanied with my wife. So, I need to make the train journeys especially the long journeys hustle free.
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the info of the forum, as per my plan, I'll travel as follows:
1. 13023/Howrah - Gaya Express,17-12-14 > 19:50 to 17-12-14 > 22:37,HWH/Kolkata Howrah Junction to BHP/Bolpur Shantiniketan
2. 13149/Kanchan Kanya Express,18-12-14 > 23:17 to 19-12-14 > 08:00,BHP/Bolpur Shantiniketan to SGUJ/Siliguri Junction
3. 15651/Lohit Express,22-12-14 > 21:40 to 24-12-14 > 12:30,NJP/New Jalpaiguri Junction to JAT/Jammu Tawi
4. 12414/Pooja SF Express,28-12-14 > 18:15 to 29-12-14 > 12:20,JAT/Jammu Tawi to AII/Ajmer Junction
5. 12548/Ahmedabad - Agra Fort SF Express,30-12-14 > 02:10 to 30-12-14 > 08:20,AII/Ajmer Junction to AF/Agra Fort
6. 12988/Ajmer - Sealdah Express,30-12-14 > 19:20 to 31-12-14 > 15:55,AF/Agra Fort to SDAH/Kolkata Sealdah
What I need to know is, if I want to book twin bed berth (so that we can be in private, ensuring no botheration by any other passenger), how can I do that? And how can I be sure to ensure the best choice available of a train?
Additionally, I need to know how can I go to HWH from KOAA? The time I'll have is: 17-12-14 > 18:45 to 17-12-14 > 19:50. As I searched, there is no train available for this journey. What will be the best and safe option to get there? Cheaper is better; but safe.
I am very much grateful to this site. Only by utilizing this site, I have prepared my journey. I hope I can get fruitful answer.
Regards.
Razib.